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//$Id: $
package org.hibernate.annotations;
import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.FIELD;
import javax.persistence.Column;
/**
* Define the map key columns as an explicit column holding the map key
* This is completly different from {@link javax.persistence.MapKey} which use an existing column
* This annotation and {@link javax.persistence.MapKey} are mutually exclusive
*
* @author Emmanuel Bernard
*/
@
Target({METHOD, FIELD
})
@
Retention(RUNTIME
)
public @
interface MapKey
{
Column
[] columns
() default {};
/**
* Represent the key class in a Map
* Only useful if the collection does not use generics
*/
Class targetElement
() default void.
class;
/**
* The optional map key type. Guessed if default
*/
Type type
() default @
Type(type =
"");
}